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Date: Thu, 15 Nov 2018 16:52:53 +0800 From: Ming Lei <ming.lei@...hat.com> To: Jens Axboe <axboe@...nel.dk> Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, Ming Lei <ming.lei@...hat.com>, Dave Chinner <dchinner@...hat.com>, Kent Overstreet <kent.overstreet@...il.com>, Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com, Alexander Viro <viro@...iv.linux.org.uk>, linux-fsdevel@...r.kernel.org, Shaohua Li <shli@...nel.org>, linux-raid@...r.kernel.org, linux-erofs@...ts.ozlabs.org, David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org, "Darrick J . Wong" <darrick.wong@...cle.com>, linux-xfs@...r.kernel.org, Gao Xiang <gaoxiang25@...wei.com>, Christoph Hellwig <hch@....de>, Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org, Coly Li <colyli@...e.de>, linux-bcache@...r.kernel.org, Boaz Harrosh <ooo@...ctrozaur.com>, Bob Peterson <rpeterso@...hat.com>, cluster-devel@...hat.com Subject: [PATCH V10 06/19] fs/buffer.c: use bvec iterator to truncate the bio Once multi-page bvec is enabled, the last bvec may include more than one page, this patch use bvec_last_segment() to truncate the bio. Cc: Dave Chinner <dchinner@...hat.com> Cc: Kent Overstreet <kent.overstreet@...il.com> Cc: Mike Snitzer <snitzer@...hat.com> Cc: dm-devel@...hat.com Cc: Alexander Viro <viro@...iv.linux.org.uk> Cc: linux-fsdevel@...r.kernel.org Cc: Shaohua Li <shli@...nel.org> Cc: linux-raid@...r.kernel.org Cc: linux-erofs@...ts.ozlabs.org Cc: David Sterba <dsterba@...e.com> Cc: linux-btrfs@...r.kernel.org Cc: Darrick J. Wong <darrick.wong@...cle.com> Cc: linux-xfs@...r.kernel.org Cc: Gao Xiang <gaoxiang25@...wei.com> Cc: Christoph Hellwig <hch@....de> Cc: Theodore Ts'o <tytso@....edu> Cc: linux-ext4@...r.kernel.org Cc: Coly Li <colyli@...e.de> Cc: linux-bcache@...r.kernel.org Cc: Boaz Harrosh <ooo@...ctrozaur.com> Cc: Bob Peterson <rpeterso@...hat.com> Cc: cluster-devel@...hat.com Signed-off-by: Ming Lei <ming.lei@...hat.com> --- fs/buffer.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/buffer.c b/fs/buffer.c index 1286c2b95498..fa37ad52e962 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -3032,7 +3032,10 @@ void guard_bio_eod(int op, struct bio *bio) /* ..and clear the end of the buffer for reads */ if (op == REQ_OP_READ) { - zero_user(bvec->bv_page, bvec->bv_offset + bvec->bv_len, + struct bio_vec bv; + + bvec_last_segment(bvec, &bv); + zero_user(bv.bv_page, bv.bv_offset + bv.bv_len, truncated_bytes); } } -- 2.9.5
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